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Chapter 4: Q. T4.2 (page 289)
You want to take a simple random sample (SRS) of of thestudents who live in
a dormitory on campus. You label the students in alphabetical order. In the
table of random digits, you read the entries
The first three students in your sample have labels.
The correct option is:
(e
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More oil and inflammation Refer to Exercise 55. Could blinding be used in this experiment? Explain your reasoning. Why is blinding an important consideration in this context?
A gardener wants to try different combinations of fertilizer (none, cup, cups) and mulch (none, wood chips, pine needles, plastic) to determine which combination produces the highest yield for a variety of green beans. He has green-bean plants to use in the experiment. If he wants an equal number of plants to be assigned to each treatment, how many plants will be assigned to each treatment?
a.
b.
c.
d.
e.
A popular website places opinion poll questions next to many of its news stories. Simply
click your response to join the sample. One of the questions was “Do you plan to diet this
year?” More than 30,000 people responded, with 68% saying “Yes.” Which of the
following is true?
a. About 68% of Americans planned to diet.
b. The poll used a convenience sample, so the results tell us little about the population of
all adults.
c. The poll uses voluntary response, so the results tell us little about the population of all
adults.
d. The sample is too small to draw any conclusion.
e. None of these.
Online reviews Many websites include customer reviews of products, restaurants, hotels,
and so on. The manager of a hotel was upset to see that of reviewers on a travel
website gave the hotel “star”—the lowest possible rating. Explain how bias in the
sampling method could affect the estimate.
Doctors and nurses Nurse-practitioners are nurses with advanced qualifications who often act much like primary-care physicians. Are they as effective as doctors at treating patients with chronic conditions? An experiment was conducted with patients who had been diagnosed with asthma, diabetes, or high blood pressure. Within each condition, patients were randomly assigned to either a doctor or a nurse-practitioner. The response variables included measures of the patients' health and of their satisfaction with their medical care after months.
a. Which are the blocks in this experiment: the different diagnoses (asthma, diabetes, or high blood pressure) or the type of care (nurse or doctor)? Why?
b. Explain why a randomized block design is preferable to a completely randomized design in this context.
c. Suppose the experiment used only diabetes patients, but there were still subjects willing to participate. What advantage would this offer? What disadvantage?
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